<?php
require_once 'db_conn.php';
$id=  isset($_GET['id'])?$_GET['id']:0;
$sql="delete from t_message where id='$id'";

$result=$db->query($sql);

if ($result)

    {
        echo "<script language='javascript' type='text/javascript'>";
        echo "alert('删除留言成功');";
        echo "window.location.href='index.php'";
        echo "</script>";
    }
 else 
    {
        echo "<script language='javascript' type='text/javascript'>";
        echo "alert('删除留言失败！');";
        echo "window.location.href='index.php'";
        echo "</script>";
        //die等价于exit

    }

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